Question

3．妈妈经常被误认为是我姐姐，因为她看上去非常年轻．
My mother is usually mistaken for my sister，because she looks very young．．

Answer 1

分析 My mother is usually mistaken for my sister，because she looks very young．

解答 答案：My mother is usually mistaken for my sister，because she looks very young．．表达的是客观事实用一般现在时．表示误认为mistake…for…，主语my mother是mistake的承受者，构成被动关系，故用一般现在时的被动语态am/is/are+过去分词，主语my mother三单，故is，usually 频率副词"经常"，放在be动词后面，故My mother is  usually mistaken for my sister，表示因为…用because引导的原因状语从句，she代替my mother，看起来look系动词，故looks，加上形容词young年轻的，构成系表结构，very副词"非常"，修饰young，故答案是My mother is usually mistaken for my sister，because she looks very young．．

点评 mistake as…表示象．一样的错误，或者是类似．的错误
mistake…for…是错把．当作．
例句：
The student has made the same mistake as last time．
那个学生犯了和上次一样的错误．